Centrifugal grinding machine



Patented Dec. 7, 1937 UNETED STATES PATENT OFFICE Application August 8,1935, Serial No. 35,284 In Mexico October 26, 1934 Claims.- (01. 83-7)This invention relates to a grinding machine or mill of the centrifugaltype and in which the grinding is accomplished by friction between apair of grinding stones or disks disposed in axial 5 alinement, one ofthe features of the present invention being the inclination of the mainaxis on which the grinding disks are mounted, said axis forming an angleless than a right angle to the vertical. Another feature of theinvention is that the frame of the machine is of the console type, thusaffording ready access to all parts thereof, and particularly to themilling members.

Still another feature is the provision of fluid pressure means foreffectively controlling the axial pressure of the grinding disks.

The principal features of the machine are clearly explained in thefollowing description of its operation and in the accompanying drawing,'which illustrates the machine in side view, certain parts being brokenaway and shown in section.

The grains or material that are to be ground are deposited in a hopper Iadapted for the purpose, and in its lowerpart. This hopper l rctates andbeing handled at the operators ease permits the material to betransferred during rotation to the side that forms the smaller anglewith the vertical where the material, by gravity, goes into themillstones through the feeding tube, thus facilitating the circulationat the stirrer I6 which is threaded at the upper end of the main axle,as is clearly shown in the accompanying drawing. During the millingprocess the material is expelled by centrifugal 35 force towards theperiphery of the discs and gathered within the walls of the adjustablescreen 5 falling easily, afterwards, into the rotating pan 1 where theoperator can easily pick up the ground product on the higher part ofsaid pan. The adjustable blade 6 facilitates the complete gathering ofthe products when cleaning the inher surface of the walls of the screen5. The' rod of this blade 6 is fastened to the disc 1, in which it is somounted as to permit the quick adjustment of the height of said blade.

For the cleaning and inspection of the milling devices a combination ofwheel and worm has been arranged that permits the lifting of the upperpart of the frame by means of crank and rod ll thus making that part ofthe frame rotate on pin 3 where the articulation is established. Thisrotating efiect is obtained by turning the fly Wheel with crank l2 onthe shaft of which the worm of the wheel is mounted.

55 When millstones of basaltic or quartzose rock are used their relativewearing is compensated by means of bolster 3 which is threaded to theupper part of the frame and fastened, as seen in the drawing, by clutch2 which is lodged in a cut made according to the axis of the threaded 5chamber.

The pressure required for the grinding is imparted to this machine bythe oscillations of lever I9 which in turn operates, by means of a smallrod, pump piston 53 which is connected 10 with distributing chamber I0and hydraulic cylinder, 8 the piston of which operates directly on theaxial bearing of the main axtree. The pressure exerted upon the rubbingfaces of the millstones can be read on pressure gauge I3. 15 To producean immediate cessation of pressure, lever 14 has been installed. Its rodobturates the by-pass of the chamber, thus permitting a certain amountof liquid to flow from the cylinder 8 into the cylinder of the pump 9thereby 20 automatically relieving the pressure on the piston in saidcylinder 8.

To recover the original pressure, one oscillation of the lever I9 isenough to let the volume of the displaced liquid return to the spaceformerly occupied in the cylinder.

To displace the contents of cylinder 8 lever 15, situated below thecollecting pan, is operated.

In the drawing, this machine is shown as operated by direct couplingwith electric motor I! by means of the counter-shaft and the conicalgears 2| and 22. If desired it also can be coupled to an internalcombustion engine or to any other kind of engine, both placed in acommon base so as to have a unit with its own motive force. However, abelt and pulley drive may be substituted for the coupling 20, ifdesired.

Having thus described my invention, what I claim is: v

1. A centrifugal grinding machine of the friction disk type, comprisingtwo articulated arms disposed in the same vertical plane and eachcarrying a grinding disk, the upper disk being fixed and the lower onerotary, said disks being disposed in parallel longitudinal alinement ina 5 plane inclined to the vertical and normally having their abuttingfaces in contact over their entire area, and means for raising one ofsaid arms thereby to separate the disks, said means comprising a wormWheel mounted for rotation on one of said arms, a link eccentricallypivoted at one end on said worm wheel and pivoted at its opposite end onthe other arm, a worm in engagement with said worm wheel, and means forrotating said worm.

Dec. 7, 1937. w MElNERT 2,101,443

AIR BRAKE FOR AEROPLANES Filed March 25, 1937 INVENT OR.

M14) ME/IVERT BY

